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Stockholders' Equity - Summary of Number of PSUs Granted Based on Adjusted EBITDA and Grant Date Fair Value (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares issued for SLO awards 71,893 101,062 51,321
PSUs – Adjusted EBITDA [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares issued for SLO awards 158,964 239,851 451,264
Restricted stock for granted, Weighted- Average per Share Fair Value on Grant Date during the year $ 46.05 $ 32.72 $ 20.23